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Mon, 7 Sep 2026 06:57:31 +0000 Message-ID: Date: Mon, 7 Sep 2026 08:57:27 +0200 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/8] net: mrmac: Fix Rx packet loss on back-to-back frames To: Padmarao Begari , u-boot@lists.u-boot-project.org Cc: git@amd.com References: <20260820092623.1647844-1-padmarao.begari@amd.com> Content-Language: en-US From: Michal Simek Autocrypt: addr=michal.simek@amd.com; keydata= xsFNBFFuvDEBEAC9Amu3nk79+J+4xBOuM5XmDmljuukOc6mKB5bBYOa4SrWJZTjeGRf52VMc howHe8Y9nSbG92obZMqsdt+d/hmRu3fgwRYiiU97YJjUkCN5paHXyBb+3IdrLNGt8I7C9RMy svSoH4WcApYNqvB3rcMtJIna+HUhx8xOk+XCfyKJDnrSuKgx0Svj446qgM5fe7RyFOlGX/wF Ae63Hs0RkFo3I/+hLLJP6kwPnOEo3lkvzm3FMMy0D9VxT9e6Y3afe1UTQuhkg8PbABxhowzj SEnl0ICoqpBqqROV/w1fOlPrm4WSNlZJunYV4gTEustZf8j9FWncn3QzRhnQOSuzTPFbsbH5 WVxwDvgHLRTmBuMw1sqvCc7CofjsD1XM9bP3HOBwCxKaTyOxbPJh3D4AdD1u+cF/lj9Fj255 Es9aATHPvoDQmOzyyRNTQzupN8UtZ+/tB4mhgxWzorpbdItaSXWgdDPDtssJIC+d5+hskys8 B3jbv86lyM+4jh2URpnL1gqOPwnaf1zm/7sqoN3r64cml94q68jfY4lNTwjA/SnaS1DE9XXa XQlkhHgjSLyRjjsMsz+2A4otRLrBbumEUtSMlPfhTi8xUsj9ZfPIUz3fji8vmxZG/Da6jx/c a0UQdFFCL4Ay/EMSoGbQouzhC69OQLWNH3rMQbBvrRbiMJbEZwARAQABzSlNaWNoYWwgU2lt ZWsgKEFNRCkgPG1pY2hhbC5zaW1la0BhbWQuY29tPsLBlAQTAQgAPgIbAwULCQgHAgYVCgkI CwIEFgIDAQIeAQIXgBYhBGc1DJv1zO6bU2Q1ajd8fyH+PR+RBQJn8lwDBQkaRgbLAAoJEDd8 fyH+PR+RCNAP/iHkKbpP0XXfgfWqf8yyrFHjGPJSknERzxw0glxPztfC3UqeusQ0CPnbI85n uQdm5/zRgWr7wi8H2UMqFlfMW8/NH5Da7GOPc26NMTPA2ZG5S2SG2SGZj1Smq8mL4iueePiN x1qfWhVm7TfkDHUEmMAYq70sjFcvygyqHUCumpw36CMQSMyrxyEkbYm1NKORlnySAFHy2pOx nmXKSaL1yfof3JJLwNwtaBj76GKQILnlYx9QNnt6adCtrZLIhB3HGh4IRJyuiiM0aZi1G8ei 2ILx2n2LxUw7X6aAD0sYHtNKUCQMCBGQHzJLDYjEyy0kfYoLXV2P6K+7WYnRP+uV8g77Gl9a IuGvxgEUITjMakX3e8RjyZ5jmc5ZAsegfJ669oZJOzQouw/W9Qneb820rhA2CKK8BnmlkHP+ WB5yDks3gSHE/GlOWqRkVZ05sUjVmq/tZ1JEdOapWQovRQsueDjxXcMjgNo5e8ttCyMo44u1 pKXRJpR5l7/hBYWeMlcKvLwByep+FOGtKsv0xadMKr1M6wPZXkV83jMKxxRE9HlqWJLLUE1Q 0pDvn1EvlpDj9eED73iMBsrHu9cIk8aweTEbQ4bcKRGfGkXrCwle6xRiKSjXCdzWpOglNhjq 1g8Ak+G+ZR6r7QarL01BkdE2/WUOLHdGHB1hJxARbP2E3l46zsFNBFFuvDEBEACXqiX5h4IA 03fJOwh+82aQWeHVAEDpjDzK5hSSJZDE55KP8br1FZrgrjvQ9Ma7thSu1mbr+ydeIqoO1/iM fZA+DDPpvo6kscjep11bNhVa0JpHhwnMfHNTSHDMq9OXL9ZZpku/+OXtapISzIH336p4ZUUB 5asad8Ux70g4gmI92eLWBzFFdlyR4g1Vis511Nn481lsDO9LZhKyWelbif7FKKv4p3FRPSbB vEgh71V3NDCPlJJoiHiYaS8IN3uasV/S1+cxVbwz2WcUEZCpeHcY2qsQAEqp4GM7PF2G6gtz IOBUMk7fjku1mzlx4zP7uj87LGJTOAxQUJ1HHlx3Li+xu2oF9Vv101/fsCmptAAUMo7KiJgP Lu8TsP1migoOoSbGUMR0jQpUcKF2L2jaNVS6updvNjbRmFojK2y6A/Bc6WAKhtdv8/e0/Zby iVA7/EN5phZ1GugMJxOLHJ1eqw7DQ5CHcSQ5bOx0Yjmhg4PT6pbW3mB1w+ClAnxhAbyMsfBn XxvvcjWIPnBVlB2Z0YH/gizMDdM0Sa/HIz+q7JR7XkGL4MYeAM15m6O7hkCJcoFV7LMzkNKk OiCZ3E0JYDsMXvmh3S4EVWAG+buA+9beElCmXDcXPI4PinMPqpwmLNcEhPVMQfvAYRqQp2fg 1vTEyK58Ms+0a9L1k5MvvbFg9QARAQABwsF8BBgBCAAmAhsMFiEEZzUMm/XM7ptTZDVqN3x/ If49H5EFAmfyXCkFCRpGBvgACgkQN3x/If49H5GY5xAAoKWHRO/OlI7eMA8VaUgFInmphBAj fAgQbW6Zxl9ULaCcNSoJc2D0zYWXftDOJeXyVk5Gb8cMbLA1tIMSM/BgSAnT7As2KfcZDTXQ DJSZYWgYKc/YywLgUlpv4slFv5tjmoUvHK9w2DuFLW254pnUuhrdyTEaknEM+qOmPscWOs0R dR6mMTN0vBjnLUeYdy0xbaoefjT+tWBybXkVwLDd3d/+mOa9ZiAB7ynuVWu2ow/uGJx0hnRI LGfLsiPu47YQrQXu79r7RtVeAYwRh3ul7wx5LABWI6n31oEHxDH+1czVjKsiozRstEaUxuDZ jWRHq+AEIq79BTTopj2dnW+sZAsnVpQmc+nod6xR907pzt/HZL0WoWwRVkbg7hqtzKOBoju3 hftqVr0nx77oBZD6mSJsxM/QuJoaXaTX/a/QiB4Nwrja2jlM0lMUA/bGeM1tQwS7rJLaT3cT RBGSlJgyWtR8IQvX3rqHd6QrFi1poQ1/wpLummWO0adWes2U6I3GtD9vxO/cazWrWBDoQ8Da otYa9+7v0j0WOBTJaj16LFxdSRq/jZ1y/EIHs3Ysd85mUWXOB8xZ6h+WEMzqAvOt02oWJVbr ZLqxG/3ScDXZEUJ6EDJVoLAK50zMk87ece2+4GWGOKfFsiDfh7fnEMXQcykxuowBYUD0tMd2 mpwx1d8= In-Reply-To: <20260820092623.1647844-1-padmarao.begari@amd.com> Content-Type: text/plain; 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This shows up > with multiple boards on a switch, where the extra traffic makes > back-to-back arrivals common and network transfers time out. > > Fixing that needs an Rx ring the driver can index, so the series first > makes the ring scalable and then fixes the bug: > > 1-3 Independent cleanups: check memalign() failures, give the > driver its own Rx buffer pool instead of borrowing the shared > net_rx_packets[], and read the link speed from the standard > max-speed property. > > 4-6 Make the descriptor ring scale: index the contiguous BD blocks > directly, build the Rx chain in a loop over RX_DESC, and > program CURDESC only once the ring is complete in memory. > > 7 Track the descriptor to consume next in rx_bd_idx and take > completion from the per-descriptor COMPLETE bit, so a > descriptor goes back to hardware only after the network stack > has read it. > > 8 Size the Rx ring from ETH_PACKETS_BATCH_RECV, so a full > eth_rx() call can be served without hardware running out of > descriptors. > > Padmarao Begari (8): > net: mrmac: check memalign() return values > net: mrmac: use a driver-owned RX buffer pool > net: mrmac: switch to max-speed property > net: mrmac: use contiguous BD arrays > net: mrmac: initialize the Rx BD ring in a loop > net: mrmac: write CURDESC after ring setup > net: mrmac: fix Rx packet loss on back-to-back frames > net: mrmac: increase the Rx BD ring > > drivers/net/xilinx_axi_mrmac.c | 235 +++++++++++++++++---------------- > drivers/net/xilinx_axi_mrmac.h | 20 ++- > 2 files changed, 137 insertions(+), 118 deletions(-) > Applied. M